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P0231 2009 Ford Fusion Code - Fuel Pump Secondary Circuit Low

Quick Answer

The P0231 diagnostic trouble code (DTC) for a 2009 Ford Fusion indicates a problem with the fuel pump secondary circuit being low. Common causes include Faulty fuel pump relay, Damaged fuel pump, Short or open circuit in the wiring. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0231 2009 Ford Fusion indicates Fuel Pump Secondary Circuit Low.
Common causes
Common causes include Faulty fuel pump relay, Damaged fuel pump, Short or open circuit in the wiring.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P0231 2009 Ford Fusion Description

The P0231 diagnostic trouble code (DTC) for a 2009 Ford Fusion indicates a problem with the fuel pump secondary circuit being low. This means that the powertrain control module (PCM) has detected a voltage signal from the fuel pump secondary circuit that is below the expected range. The fuel pump secondary circuit is responsible for providing power to the fuel pump, which is essential for delivering fuel from the tank to the engine. When this circuit is not functioning properly, it can lead to a variety of issues that can affect the vehicle's performance and overall operation.

OBDII Code P0231 2009 Ford Fusion - Fuel Pump Secondary Circuit Low
P0231 2009 Ford Fusion Code - Fuel Pump Secondary Circuit Low

Common Causes of P0231 2009 Ford Fusion

  1. Faulty fuel pump relay
  2. Damaged fuel pump
  3. Short or open circuit in the wiring
  4. Issues with the PCM
  5. Corrosion or damage to electrical connections

Symptoms of P0231 2009 Ford Fusion

  1. Engine hesitation or stalling
  2. Difficulty starting the vehicle
  3. Poor acceleration
  4. Decreased fuel efficiency
  5. Illumination of the check engine light

How to Fix P0231 2009 Ford Fusion

  1. Begin by conducting a thorough inspection of the fuel pump relay, fuel pump, and wiring connections to identify any visible signs of damage or wear.
  2. Test the fuel pump relay and fuel pump using a multimeter to determine if they are functioning within the manufacturer's specifications.
  3. Check for any shorts or open circuits in the wiring using a wiring diagram and continuity tester.
  4. If necessary, replace the faulty fuel pump relay, fuel pump, or repair any damaged wiring or connections.
  5. Clear the DTC using a scan tool and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0231 2009 Ford Fusion

The typical repair costs for addressing a P0231 code on a 2009 Ford Fusion can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It is important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. Factors such as location, vehicle make and model, and engine type can also impact the overall repair costs. It is advisable to consult with a trusted mechanic or repair shop to obtain a more accurate estimate based on your specific circumstances.

What does this mean?

Tech Notes for P0231 2009 Ford Fusion

For some FORD models:

1. Disconnect the inertia switch harness connector

2. Turn key to ON position (Engine OFF)

3. Measure voltage of circuit between inertia switch harness connector and ground

4. If battery voltage is found, replaced Inertia Switch

5. Clear codes.

When is the Code Detected?

The code will be set if a low voltage on the control circuit of the fuel pump relay is detected by the ECM.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0231 2009 Ford Fusion Code

1. What does the OBDII code P0231 mean on a 2009 Ford Fusion?

P0231 indicates a low voltage condition in the fuel pump secondary circuit, which may prevent proper fuel delivery to the engine.

2. What are the common symptoms of code P0231 in a 2009 Ford Fusion?

Symptoms may include difficulty starting, engine stalling, poor acceleration, or complete engine failure.

3. What causes the P0231 code to trigger in a 2009 Ford Fusion?

Common causes include a faulty fuel pump relay, damaged wiring or connectors in the fuel pump circuit, a failing fuel pump, or a bad powertrain control module (PCM).

4. Can I drive my 2009 Ford Fusion with a P0231 code?

Driving with this code is not recommended as it can lead to engine stalling or failure, potentially creating unsafe driving conditions.

5. How do I diagnose the P0231 code on my 2009 Ford Fusion?

Diagnosis involves checking the fuel pump relay, inspecting the wiring and connectors in the fuel pump circuit, and testing the fuel pump for proper operation.

6. How can I fix the P0231 code on my 2009 Ford Fusion?

Repairs may include replacing a faulty fuel pump relay, repairing damaged wiring, replacing the fuel pump, or reprogramming the PCM if necessary.

7. How much does it cost to fix the P0231 code on a 2009 Ford Fusion?

Repair costs can vary. Replacing a fuel pump relay may cost $50–$100, whereas replacing a fuel pump could cost $300–$800 depending on labor rates.

8. Can a weak battery cause a P0231 code on a 2009 Ford Fusion?

Yes, a weak or failing battery can result in low voltage in the fuel pump circuit and trigger the P0231 code.

9. What tools are needed to troubleshoot a P0231 code on a 2009 Ford Fusion?

Essential tools include a digital multimeter to test voltage, an OBDII scanner to confirm the code, and wiring diagrams for the fuel pump circuit.

10. Is the P0231 code common in Ford vehicles like the 2009 Fusion?

While not extremely common, issues with the fuel pump circuit can occur in Ford vehicles, especially as they age or if there’s electrical system wear.

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